Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
nhung cong » dung cong, thong cong, hang cong
lang thanh » tang thanh, lang thang, nang thanh
dang thanh » dang hanh, hoang thanh, quang thanh
dong thanh » truong thanh
hien hanh » dieu hanh
trinh van » trinh han, trinh quan, trinh toan
van nhung » van nhuong, va nhung, van hung

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien hanh - canh trinh van nhung cong ((lang thanh) or (((dang thanh) OR (dong thanh)))) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien hanh - canh trinh van nhung cong ((lang thanh) OR (((dang thanh) OR (dong thanh)))) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien hanh - canh trinh van nhung cong ((lang thanh) or (((dang thanh) OR (dong thanh)))) cao".
• Adding a wildcard symbol may retrieve word variants: hoc hien hanh - canh trinh van nhung cong ((lang thanh) or (((dang thanh) OR (dong thanh)))) cao*.